Yes

you do need a jacket based on the weather in Toronto, ON, Canada 10 minutes ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
57°F14°C & Mostly Clear

Wind is 4 mph6 km/h from the Northeast, gusting to 7 mph11 km/h
September 10
6am56°F13°C4 mph7 km/h NorthCloudy
7am56°F13°C3 mph6 km/h NorthMostly Cloudy
8am57°F14°C3 mph5 km/h NorthMostly Cloudy
9am60°F16°C2 mph4 km/h NorthMostly Cloudy
10am65°F18°C1 mph2 km/h EastPartly Cloudy
11am67°F20°C2 mph3 km/h SouthMostly Cloudy
12pm69°F21°C3 mph5 km/h SouthMostly Cloudy
1pm71°F22°C4 mph6 km/h SouthMostly Cloudy
2pm72°F22°C4 mph6 km/h SouthMostly Cloudy
3pm73°F23°C4 mph7 km/h SouthMostly Cloudy
4pm73°F23°C4 mph7 km/h SoutheastMostly Cloudy
5pm73°F23°C4 mph7 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
September 1056°F13°C73°F23°C3 mph5 km/h from SoutheastMostly CloudyPartly Cloudy
September 1158°F15°C74°F23°C4 mph6 km/h from NortheastMostly ClearMostly Clear
September 1260°F15°C72°F22°C5 mph9 km/h from EastPartly CloudyPartly Cloudy
September 1360°F16°C74°F23°C5 mph8 km/h from SouthRainRain
September 1459°F15°C71°F22°C8 mph12 km/h from NorthPartly CloudyClear
September 1554°F12°C70°F21°C6 mph9 km/h from NortheastPartly CloudyMostly Clear
September 1657°F14°C72°F22°C4 mph7 km/h from SoutheastMostly ClearMostly Clear

Yes

Low of 58°F15°C, High of 73°F23°C
Wind: 4 mph6 km/h
Precipitation: None

Support This Page